1. I see nobody noticed, that eliminating only the king's LAND forces is needed for victory, so i suggest not to build war ships, because they cost a lot of stuff and time to build (and dont have a chance vs. man-o-wars). Mass cannons and guns instead. Try to avoid city defense (concentrate on one city, let him take the rest), because his artillery with 4 strength and +150% city attack is nearly unstoppable, but if you attack his cities, your cannons will also get +100%

2. If you cannot trade goods with europe any more, try to sell it to other european colonies.

3. Fortified soldiers in a city built on hills (+25%+25%=+50%) are stronger than dragoons, because mounted units do not get def bonuses